Lifting-jack



(No Model.)

H. WILSON. LIPTING JACK.

No. 436,943. Patented Sept. 23, 1890.

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. UNITED STATES PATENT OFFICE.

HUGH WILSON, OF DUNCANS MILLS, CALIFORNIA.

Ll FTl NG-JAC K.

SPECIFICATION forming part of Letters Patent No. 436,943, datedSeptember 23, 1890.

Application filed Tune 2, 1890. Serial No. 354,039. (No model.)

To all whom it may concern:

Be it known that I, HUGH WILSON, a citizen of the United States,residing at Duncans Mills, Sonoma county, State of California, haveinvented an Improvement in Lifting- Jacks; and I hereby declare thefollowing to be a full, clear, and exact description of the same.

My invention relates to that class of liftingjacks used in the handlingof heavy articles, and especially for the movement of heavy logs in thelumber business. This class of jacks employs a vertically-slidinglifting-bar operated by gearing contained within a case through whichthe lifting-bar slides.

My invention consists of an improved construction of this casing and ofthe ratchetpawl, by which the movement of the gearing is arrested at anydesired point, so as to hold the lifting-bar and its load whereverdesired.

Referring to the accompanyingdrawings for amore complete explanation ofmy invention, Figure 1 is an exterior view of mylifting-jack, showingthe holding pawl engaging the ratchet-wheel in one position in fulllines and in the other position in dotted lines. Fig. 2 is a viewshowing the two parts of the case separated and illustrating itsconstruction.

A is the lifting-bar, made of steel and having a suitable swivel head ordog B upon its top to support the weight to be lifted.- This bar hasteeth upon one edge, which are engaged by the corresponding teeth of apinion D, and this pinion is actuated by a gear-wheel E, which is castor formed with it upon the same shaft.

F is a pinion upon the second shaft G, and this pinion engages with thegear-wheel E, and through a crank II upon the shaft G of this pinionsufficient power is produced to operate the lilting-bar and raise theweight to any desired position. The lifting-bar slides through arectangular channel formed in the casing which incloses the gearingherein described, and the shafts of the gears are journaled in the sidesof this casing.

As the weights to be raised by this class of jacks are very great inproportion to the size of the apparatus, it is necessary that all theparts should be made of steel and in thestrongest manner.

The casing consists of the two sides I and J.

The side I has the projecting edge or flange I surrounding its lowerportion, and within the lower part of this flange is formed therectangular guiding channel or opening in this portion of the case,through which the liftingbar slides. Surrounding this rectangularopening and extending a short distance below it is a portion K, which isformed cylindrically and has a screw-thread cut upon the outside, sothat the standard L may be easily screwed upon or removed from thebottom of the case.

The side J of the casing has a projecting lug M at the bottom, whichforms the remaining side of the rectangular guide-opening of the bottomof the case, and below this lug is the segmental extension K, which whenthe two parts of the case are put together completes the screw-threadedportion K, upon which the standard is screwed. Around; the upper portionof the part J of this casing the flange J extends and has therectangular channel N formed in it, through which the lifting-bar isguided in the upper portion of the case and above the gearing. When thetwo parts of the case are put together, a lug 0, formed upon a part I ofthe case, enters the space which is left open on one side of thischannel N, and thus forms the remaining side of the upper guide-channel.The parts of the casing are preferably made of caststeel, and thejournal openings for the ends of the gear-shafts are cored out whenthese two sides are cast. Holes are also cored through the projectingflanges I and J, as shown at P, for the reception of the bolts Q, bywhich the parts are held together. It will be seen from thisconstruction that the flanges I upon the portion I of the case interlockwith the flanges J of the side .I of the case, and that the main portionof the lower part of the guide-opening for the lifting-bar is formed inthe flange I, while similarlythe main portion of the guide-opening atthe upper part of the case is formed in the flange J. The correspondinglugs M and 0 upon the opposite side plates fill, respectively, theremaining sides of these openings and form a case of sufficient strengthfor all strains which may be brought upon it.

When casting the two parts of the casing,

projecting hubs or bosses Zare formed upon other is shown as inengagement.

the exterior of the sides, so as to give suffi-. cient thickness for thebearings of the gearshafts, and in one of these bosses a hole is coredto receive the fulcrum-pin R of the pawl S. This pawl is adapted toengage the ratchetwheel T and hold it at any desired point to which thelifting-bar may have been raised by turning the crank H. This pawl ismade with two dogs or engaging-catches U and U, one upon one side andthe other upon the opposite side.

In Fig. 1 the pawl is shown in full lines as engaging the ratchet-wheelthrough one of these holding-dogs, and in dotted lines the The pawl isfulcrumed with such relation to the ratchetwheel that it will engage theteeth by gravitation whichever position it may occupy, and it is notnecessary to hold it down by hand or by a spring to insure itsproperly'holding the parts in'pOSition to which they have been raised.

A projecting end or tail V, extending to the opposite side of thefulcrum-pin, makes it easy two sides having the projecting flanges, one

upon the lower and the other upon the upper half of the side and adaptedto interlock with each other, guide-channels for the lifting-bar formedone in the lower part of one side and the other in the upper part of theopposite side, and corresponding lugs upon the opposing sides fittinginto these guide-channels,

the gear-wheel E, mounted between said sides and having the pinion D, asecond pinion for operating the gear-Wheel, and the toothed lifting-bar,substantially as herein described.

2. In a lifting-jack, the containing-case for the gears, consisting ofthe two sides, one hav ing the flange and guide-channel for thelifting-bar formed around the lower portion and the other having asimilar flange and guidechannel formed around its upper portion,corresponding lugs fitting into said guide-channels from the opposingsides, and an extension or sleeve projecting around the lowerguidechannel, substantially as herein described.

3. In a lifting-jack, the casing formed of the two sides having theinterlocking projecting flanges, the guide-channels formed in'the topand bottom of the two parts of the case, and corresponding lugs formingthe remaining sides of these guide-channels, a sleeve formed with andprojecting from the lower end of the case, having screw-threads out uponit, in combination with the tubular standard adapted to screw upon saidsleeve and forming a casing into which the lower part of the lifting-bardescends and within which it is protected, substantially as hereindescribed.

4. In a lifting-jack, the casing containing the gearing, a toothedlifting-bar sliding through guide-openings in the top and bottom of saidcasing, so as to be operated by the gearing contained therein, and acrank-shaft projecting through the side of the casing and carrying aratchet-wheel, in combination with the pawl fulcrumed in line above saidratchetwheel and having the dogs or projections U and U upon oppositesides and adapted to engage the ratchet-wheel, substantially as hereindescribed.

In witness whereof I have hereunto set my hand.

HUGH WILSON.

Witnesses:

S. H. NoURsE, H. 0. LEE.

